Crestron CNCS User manual

CRESTRON CNCS AC Current Sensor

REMOTE CONTROL SYSTEMS

1DOC. 8079C

Specifications subject to change without notice.

CRESTRON ELECTRONICS, INC.

FULL

PARTIAL

COMMON

1000 W MAX

AC INPUT

OUT

GND

24+

CNCS

PWR

CW =INCREASED THRESHOLD

PARTIAL

LOAD

FULL

LOAD

AC OUTPUT

MAX

1000 W

FRONT PANEL BACK PANEL

Figure 1. CNCS, AC Current Sensor

DESCRIPTION:

The CNCS, illustrated in figure 1, measures the average current of each half cycle of an AC load.

The current sensing circuitry is highly sensitive with a wide range of adjustment. The high

sensitivity makes the CNCS ideally suited for use with low power units such as VCRs, TV tuners,

and satellite receivers. The wide range makes the CNCS ideally suited for medium and high

powered units such as TV sets, video projectors, and power amplifiers.

The CNCS provides an isolated relay closure when the average current drawn by a monitored unit

exceeds the FULL LOAD preset threshold.

A second set of relay contacts determine whether the average current is less than FULL LOAD,

but more than no load. This PARTIAL LOAD threshold is also adjustable. The FULL LOAD and

PARTIAL LOAD relay closures are mutually exclusive so that only one closure is ever connected to

the common. However, FULL LOAD and PARTIAL LOAD indicators are implemented, so that at

FULL LOAD, both LEDs are illuminated.

Threshold adjustments are accomplished by use of a 15-turn precision potentiometer (POT). The

POT permits highly accurate and repeatable current threshold settings.

LEADING SPECIFICATIONS:

Table 1 provides a summary of leading specifications for the CNCS. Dimensions and weight are

approximations rounded to the nearest tenth unit.

Table 1. Leading Specifications

SPECIFICATION DETAILS

Power Requirements 24 VDC, Load Factor of 3 W

MaximumACLoad 8.5 A, 1 KW at 120 VAC

MinimumACLoad 0.033 A, 4 W at 120 VAC

VoltageRange 0 to 220 VAC, 45 to 65 Hz

Relay Contact Rating 1 A, 24 V (AC or DC)

CRESTRON CNCS AC Current Sensor

REMOTE CONTROL SYSTEMS

2DOC. 8079C

Specifications subject to change without notice.

Table 1. Leading Specifications (continued)

SPECIFICATION DETAILS

Dimensions&Weight Height: 1.8 in (4.6 cm)

Width: 4.2 in (10.7 cm)

Depth: 4.3 in (10.9 cm)

Weight: 1.8 lb (0.8 kg)

Construction 18 gauge cold-rolled steel,

blackpainted finish

LED INDICATORS:

PWR (Power)

The green LED illuminates when 24 volts DC is supplied to the CNCS.

FULL LOAD

Thered LED illuminates whenFULLLOADthresholdhas been exceeded.

PARTIAL LOAD

The yellow LED illuminates when PARTIAL LOAD threshold has been exceeded.

USER ADJUSTMENTS:

FULL LOAD Threshold

Clockwise (CW) rotation of the 15-turn POT increases threshold (i.e., reduces sensitivity) and changes

partial load threshold, accordingly.

PARTIAL LOAD Threshold

Clockwise rotation of the 15-turn POT increases threshold (i.e., reduces sensitivity).

THRESHOLD ADJUSTMENTS:

Refer to figure 2 for a block diagram illustrating hookup connections for the CNCS.

NOTES

1. Do not attempt adjustments during periods of high or low power line voltage or

voltage fluctuations.

2. Partial power output may be used as the primary output if increased sensitivity is

required.

3. If the partial power output is not required, the partial power adjustment may be

placed in any position which does not cause LED flashing or relay chatter.

CRESTRON CNCS AC Current Sensor

REMOTE CONTROL SYSTEMS

3DOC. 8079C

Specifications subject to change without notice.

Figure 2. CNCS, Hookup Block Diagram

EQUIPMENT

TO BE SENSED

CNCS

AC INPUT

AC OUTPUT

OUT

GND

24+

CNTBLOCK

(OR

OTHER

TERMINAL

BLOCK)

CNMS

CNRACK(-D)

24+

CNDIO

CNIN-16

CRESNET II

NETWORK

EXTERNAL

POWER

SUPPLY

TWISTED PAIR

OPTIONAL

Low Power (Loads such as VCRs)

1. Rotate FULL LOAD POT 15 turns counterclockwise (CCW).

2. Rotate PARTIAL LOAD POT 15 turns CCW.

3. Place VCRin"ON"mode. Red and yellowLEDsshouldilluminate.

4. Slowly rotate FULL LOAD POT CW until red LED flashes and relay chatters.

5. Place VCR in "OFF" (i.e., standby) mode. Red LED should extinguish.

6. Slowly rotate FULL LOAD POT CCW and count turns until red LED flashes and relay chatters.

CRESTRON CNCS AC Current Sensor

REMOTE CONTROL SYSTEMS

4DOC. 8079C

Specifications subject to change without notice.

NOTE If the LED flash and relay chatter can not be achieved in step 6, start procedure again

with step 1. After performing step 4, rotate FULL LOAD POT two turns CCW.

Continue procedure with step 5, omitting steps 6 and 7.

7. Rotate FULLLOADPOTCW half the numberofturnsrequired in the previousstep. For example,if the

POT was rotated four CCW turns in step 6, the POT should then be rotated CW two turns for this

step.

8. Rotate PARTIAL LOAD POT CW until yellow LED flashes and relay chatters.

9. Rotate PARTIAL LOAD POT two to five turns CCW.

High Power with Partial Power (Loads such as TV Sets)

1. Rotate FULL LOAD POT 15 turns CW.

2. Rotate PARTIAL LOAD POT 15 turns CCW.

3. PlaceTVin standby mode.

4. Slowly rotate FULL LOAD POT CCW until yellow LED flashes and relay chatters.

5. Slowly rotate PARTIAL LOAD POT CW until yellow LED extinguishes.

6. Slowly rotate PARTIAL LOAD POT CW for an additional two turns.

7. Slowly rotate FULL LOAD POT CCW until yellow LED flashes and relay chatters.

8. Slowly rotate PARTIAL LOAD POT CCW for an additional two turns. Yellow LED should remain

illuminated.

High Power (Loads such as TV Sets)

1. Rotate FULL LOAD POT 15 turns CW.

2. Rotate PARTIAL LOAD POT 15 turns CCW.

3. Place TV in "ON" mode. Redandyellow LEDs should beextinguished.

4. Slowly rotate FULL LOAD POT CCW until red LED flashes and relay chatters.

5. Slowly rotate FULL LOAD POT CCW for an additional two to four turns.

CRESTRON CNCS AC Current Sensor

REMOTE CONTROL SYSTEMS

5DOC. 8079C

Specifications subject to change without notice.

PROGRAMMING:

A basic CNCS SIMPL program is illustrated in figure 4. The sample program illustrates discrete ON/OFF

fortoggle type IR control.

NOTE The program example is provided as a sample of CNCS implementation and may not

be relevant for every application.

An example follows the figure to illustrate the CRESNET II screen display for CNCS signal assignment.

The"screen saves" inthe example are accessible from the "DefineRack" section ofthe SIMPL-I Menu in

the CRESNET II Workshop and are shown for the CNDIO (which is built-in to the CRESNET II

MiniSystem) and CNIN-16 (which can be inserted into the CRESNET II MiniSystem or RACK).

NAND

FULL-LOAD

EN-OFF

POWER-OFF

BUTTON

FEEDBACK

CNDIO

INPUT

(FOR CNMS)

CNIN-16

(FOR CNRACK)

CNCS PARTIAL-LOAD

FULL-LOAD

AND

OFF OFF

BUTTON

AND POWER-ON

POW MV POWER

0.5 S

TRIG OUT IR

Figure 4. CNCS, SIMPL Program

FURTHER INQUIRIES:

If after reviewing this Operations Guide you still have additional questions, please contact a CRESTRON

technical representative by dialing (888) CRESTRON [(888) 273-7876] or (201) 894-0660.

CRESTRON CNCS AC Current Sensor

REMOTE CONTROL SYSTEMS

6DOC. 8079C

Specifications subject to change without notice.

Program Example:

CNDIO Signal Assignment

ESC to go back Module Detail F1=Help

CNDIO

Digital input/output module

Slot: 02Rack: 00

SIGNAL NAMES

INPUTS OUTPUTS

1 :

2 :

3 :

4 :

5 :

6 :

7 :

1 :

2 :

3 :

4 :

5 :

6 :

7 :

F2-Detail F3-Display Signals F4- Auto-Increment

CRESNET II Workshop v5.0

8 : 8 :

FULL-LOAD

PARTIAL-LOAD

CNIN-16 Signal Assignment

ESC to go back Module Detail F1=Help

CNIN-16

input module - 16 closures to common

Slot: 05Rack: 00

INPUT SIGNAL NAMES

1 :

2 :

3 :

4 :

5 :

6 :

7 :

1 :

2 :

3 :

4 :

5 :

6 :

7 :

F2-Detail F3-Display Signals F4- Auto-Increment

CRESNET II Workshop v5.0

8 : 8 :

FULL-LOAD

PARTIAL-LOAD

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